Stone polisher support



A g- 11, 1931 v c. s. CusHMAN 7 1,818,675

STONE 'POLISHER SUPPORT Filed March 24, 1928 2 Sheets-Sheet l 4 gwue'nl ov athyww o, a support forthe polisher of a stone polishf securedt'o the lower faceof the platformis Patented Aug. 11, 1931 I UNITED STATES CHARLES S. CUSHMAN, OF BAR-RE, VERMONT s'ronn POLISHER sUProR'r Application filed March 24,1925. Serial no. 264,454.

This invention relates to new and useful improvements in stone polishing machines, and particularly to the polishers therefor.

' One object ofthe invention is to provide ing machine which will permit movement 0 suchpolisher back and forth, across the face of the stone, and maintain the polisher in contact with the stone at a constant'degree of 1c pressure.

Another object is to provide a support of this character which is simple in construction, and which will support heavy loads.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawings.

In the drawings: I Figure 1 is a sideelevation of the device, the dotted lines representing the device as moved toward the right.

Figure 2 is an end view of the device. Figure 3 is a top plan view of the same. Figure 4 is a vertical sectional view on the line 4-4 of Figure 1. Referring particularly to the accompanying drawings, 10 represents a] suitable base or bed on which the stone to be polished is adapted to be supported. Pivotally supported on the bed or base are theupwardly extending links 11 and 12. Pivotally connected to the upper end of each of the links 11 is one end of a horizontal link 13, and similarly pivoted to the upper end of each of the links 13 isone end of a horizontal link 16, the other end of said link carrying a pin 17 g which is disposed to ride in a longitudinal slot I 18 formed in the intermediate portion of one of the links 14. Secured to, and extendi ing obliquely between the links 11, are the braces 19, similar braces 20 being secured to and extending between the links 12. A platform 21 is disposed between the links 16, and

tion of the shaft 30,'and the lower end of the of the links 12 is one end of ahorizontal link port; power ois properly bolted thereto for horizontal? movement therewith. Mounted on the said platform 21 is a motor 22, which hasa bevel gear 23 on its shaft 24'. Mounted on the platform, adjacent the motor, is a bearing 25, and;

the upper flanged end of a downwardlyextending tube 26. The lower end of said tube tube 26 is ashorter tube 29, the lower end of which projects beyond the lower endofthe tube 26. Disposed slidably in the tube 29,"6 and projecting beyond the lower end of the I tube 29, and also projectingvabove the upper end of the bearing 25,is a shaft 30, and slidably splined on the said upper end of'the shaft isa large bevel gear 31 which meshes' m with the gear 23 of the motor. In'one side of the tube 26 there is formed'a longitudinal v slot'32 in:which the toothed rack 33, carried by theshorter tube 29, is adapted to slide.- A bracket'34 is mounted on the lowerend of 7 the tube '26'andsupports the shaft 35 which is provided with a worm '36, meshing with a worm-wheel 37, also supported in said bracket. On the shaft 38, of the worm-wheel 37 is a small pinion 39 which 'meshes with vso the toothed rack 33, and whereby the said tube 29 may be moved upwardly and-downwardly. Disposed between the-lower portube 29,;are the bearing balls 40, which maintain the "shaft against 1 slidable movement within the tube 29, but permitthe free rotation ofsaid shaft. Oon'nected to the lower end of ;the 'shaf t by means of the universal joint 41, is the head 42 which carries the 9o stone polishing wheel or disk 43.

While I have shown the link assembly'in a horizontal position it will be understood that the same may be used in a vertical" p0- sition,or in an inverted'position, according to the 'condition's'under which the device is used,- thereby permitting the platform to supdriven saws, grinders, drills, and thelike.

7. Upon movement of toward the 1 right, as viewed in Figure 1, of the drawings, the Various links will assume the positions shown by the dotted lines, but it will be particularly noted that the links 16, together with the platform 21, will maintain a horizontal position, at all times. Corresponding positions will be assumed by the links, when the links 15 are moved toward the left, the frame 21, and the links 16, maintaining a horizontal position. As the links 15 swing to the right or left, the pivotal connections between the links 13 and 14, being connected with said links 15, will move upwardly, and due to the slidable connections between the links 16 with the links 14, said links 16, together with the frame 21, will maintain a horizontal position. This construction permits the polishing wheel 13 to be moved back and forth acrossthe surface of the stone being polished, while at the same time main- ,taining a constant pressure on the face of the stone, in all positions of the wheel.

Attention is particularly directed to the fact that the hub of the gear 31 is held within the bearing 25, whereby to prevent any movement of the gear longitudinally of the shaft 30. However, the shaft may readily slide through the gear, upon operation of the tube 29, through the medium of the gears 36-37.

What is claimed is:

1. A tool support including a base, links pivotally connected with the base and extending upwardly therefrom, links pivotally connected to the base carried links at their outer ends and being pivotally connected together at their inner ends, a link connected with the pivotal connections of the last-named links and having its other end connected with a support, and a link pivotally connected with the intermediate portion of one of said connected links and having its other end slidtal links. A In testimony whereof, I affix my signature.

CHARLES S. CUSHMAN.

ably and pivotally connected with the other end of the last-named links.

2. A tool support for a stone polishing machine including pairs of vertical links pivotally mounted in juxtaposition to a stone to be polished, horizontal links pivotally connected at one end to the upper ends of the vertical links and'having their other ends pivotally connected together in pairs, a horizontal tool supporting member bridging the connections between each pair of horizontal links and having its ends pivotally connected with said horizontal links, and pendant links each pivotally connected with the connections between a pair of horizontal links.

- bar bridging the connections between the 3. A tool support including vertical links v 

